http://poj.org/problem?id=2455 (题目链接) 题意 给出一张n个点,p条边的无向图,需要从1号节点走到n号节点一共T次,每条边只能经过1次,问T次经过的最大的边最小是多少. Solution 很显然,二分答案,然后建图跑最大流即可. 细节 双向边? 代码 // poj2455 #include<algorithm> #include<iostream> #include<cstdlib> #include<cstring> #i…

题目描述 Farmer John is constructing a new milking machine and wishes to keep it secret as long as possible. He has hidden in it deep within his farm and needs to be able to get to the machine without being detected. He must make a total of T (1 <= T <=…

Secret Milking Machine Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 12324   Accepted: 3589 Description Farmer John is constructing a new milking machine and wishes to keep it secret as long as possible. He has hidden in it deep within…

Secret Milking Machine Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 9658   Accepted: 2859 Description Farmer John is constructing a new milking machine and wishes to keep it secret as long as possible. He has hidden in it deep within…

Description Farmer John is constructing a new milking machine and wishes to keep it secret as long as possible. He has hidden in it deep within his farm and needs to be able to get to the machine without being detected. He must make a total of T (1 <…

[Usaco2005 feb]Secret Milking Machine 神秘的挤奶机 题目大意:约翰正在制造一台新型的挤奶机,但他不希望别人知道．他希望尽可能久地隐藏这个秘密．他把挤奶机藏在他的农场里,使它不被发现．在挤奶机制造的过程中,他需要去挤奶机所在的地方T(1≤T≤200)次．他的农场里有秘密的地道,但约翰只在返回的时候用它．农场被划分成N(2≤N≤200)块区域,用1到200标号．这些区域被P(1≤P≤40000)条道路连接,每条路有一个小于10^6的长度L．两块区域之间可能有多条…

Description Farmer John is constructing a new milking machine and wishes to keep it secret as long as possible. He has hidden in it deep within his farm and needs to be able to get to the machine without being detected. He must make a total of T (1 <…

[题意]n个点的一个无向图,在保证存在T条从1到n的不重复路径(任意一条边都不能重复)的前提下,要使得这t条路上经过的最长路径最短. 之所以把"经过的最长路径最短"划个重点是因为前面刚做了POJ2112那种求最长路径长度和最短的题,不要弄混了.在那道题中因为需要限制的是路径长度和,所以需要Floyd预处理路径,然后拆点变二分图防止间接流量边.然而这道题我们却不需要拆点了,直接建图即可.(类似最短路径和最小生成树的区别) [建图]建一个源点连一条T流量的有向边到1节点:建一个汇点从n节点…

题目链接 :        [POJ]点击打开链接        [caioj]点击打开链接 算法 : 1:跑一遍弗洛伊德,求出点与点之间的最短路径 2:二分答案,二分”最大值最小“ 3.1:建边,将原点与每头奶牛连边,流量为1,记dist[i][j]为i到j的最短路径,若dist[i][j]<=mid (K+1<=i<=K+C,1<=j<=K),则将i与j连边,流量为M,将每台挤奶机与汇点连边,流量为1 3.2 : 跑网络流,这里笔者使用的是dinic算法 3.3 : 判断…

[题目链接]: https://loj.ac/problem/10054 [题意] 我认为这个题目最难的是题意: 其实分了两种情况: 1.如果当前文本串匹配不完,那么答案的是:匹配过程中遇到的模式串结尾的个数 + 文本串结尾 的节点 ,模式串的经过该点的个数. 2.如果是文本串中途遇到问题,而不能继续匹配的情况是:匹配过程中遇到的模式串结尾的个数 只要分开这两种情况即可. [代码]: #include<cstdio> #include<cstring> #include<al…